"Teachers shouldn’t be learning on the job as they go." "Green’s book is about a more recent effort, spearheaded by a small handful of teaching revolutionaries, to improve the teaching of teaching. The common belief, held even by many people in the profession, that the best teachers are 'natural-born' is wrong, she writes. The common characteristic of her main characters is that they have broken down teaching into certain key skills, which can be taught. • 'You don’t need to be a genius,' Green told me recently. 'You have to know how to manage a discussion. You have to know which problems are the ones most likely to get the lessons across. You have to understand how students make mistakes — how they think — so you can respond to that.' Are these skills easier for some people than others? Of course they are. But they can be taught, even to people who don’t instinctively know how to do these things."